Creating a user repository

We will communicate with the database in this repository class. This is a Repository class, and so we annotate it with @Repository. Let's create a Repository class named UserRepository.kt, which extends the JpaRepository.  By extending JpaRepository, this interface will get a set of generic CRUD functions to create, update, delete, and fetch the data. 

Here is the code of the Repository class:

@Repository
interface UserRepository: JpaRepository<UserModel, Long>

Here are some functions we will get from this JPARepository:

• List<T> findAll(): To fetch all the data
• List<T> findAll(Sort var1) : To fetch all the data in sort
• List<T> findAllById(Iterable<ID> var1): To fetch data by ID
• <S extends T> List<S> saveAll(Iterable<S> var1): To insert data using the list of a data